Question

In the long or modern form of the periodic table, the element in the periodic table have been divided into four blocks, `s-p-d`-and `f`-. Each period begins with the filling of new energy shell. Two series of `f`-block elements are placed at the bottom of the periodic table.
What is the maximum number of electrons that can be accommodated with `n=5` ( `n=` principal quantum number)?
A. `10`
B. `18`
C. `36`
D. `54`

Answer 1

Correct Answer - C
Magic numbers are `2,8,8,18,18` and `32` with `n = 1`, `2,3,4,5` and `6` respectively.
`|{:(n,"No. of electrons"),(1,2),(2,2+8=10),(3,10+8=18),(4,18+18=36),(5,36+18=54):}|`